Manufactured by Baktoid Fleet Ordnance, the HMP droid gunship was an ominous-looking, heavily-shielded aerial missile platform. Designed for air strikes in planetary atmospheres, the droid gunship compensated for its sluggish airspeed with a powerful arsenal of weaponry at its disposal. An HMP gunship's standard weapons configuration consisted of two laser cannon turrets, one medium laser cannon, two light laser cannons, and 14 missiles. It also had two movable metal mandibles, for an unknown purpose, at its front.[1]
The gunship's modular wings allowed the HMP to carry a wide variety of ordnance, from concussion bombs and torpedoes to electromagnetic pulse missiles. Seven missile launchers were located on either side of the gunship's main body, below the large aft-mounted disc housing the reactor core. The HMP's repulsorlift would steadily drive the gunship in flight, allowing for stable shooting in battle. The gunship ran off an especially superdense radioactive fuel supplied by Phlac-Arphocc Automata Industries.[1]
―A gunship to General Kalani during the Battle of Onderon.[src]
A droid gunship chasing rebels on Onderon during the Clone Wars
Heavy Missile Platform gunships were developed mid-way through the Clone Wars[1] and deployed during many battles including the Battle of Kashyyyk.[9]
There were several variants of the platform, including atmospheric and space transports.[6]
Local dictators like Ado Eemon were often contracted to add to the production of the HMP. They were usually supplied with a small percent of the production run, which were used to supplement their personal forces and help enforce their own rule.[1]
Around 20 BBY,[5] a quartet of gunships were deployed under the command of super tactical droidGeneralKalani. Although they were able to kill many Onderon rebels, they were all shot down after the rebels received a shipment of missile launchers. A crashed gunship, though, used its last energy to kill the rebel leader Steela Gerrera. General Kalani then evacuated the remaining Separatist forces from the planet after the defeat.[7] The battle supplied the earliest reports of the gunship's use.[8]
Heavy Missile Platforms amongst General Grievous' fleet.
The Heavy Missile Platform resembles an early concept of the Republic gunship unused for Attack of the Clones. The head of the HMP also closely resembles that of the early concept design of the AT-AT.[source?]